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Re: Chinese Rosewood Clarinets ?

Author: Paul Aviles
Date: 2018-10-18 21:43

Ok.......sorry, I assumed knowledge of the negative and positive pressure tests.

Take the bottom joint by itself, holding it in your right hand (as if you were playing it) and engage the "E/B" paddle key. Then you cover the bottom of joint with the heel of your left hand. Place your lips over the top end and blow into it to execute positive pressure. You should feel resistance and NOT hear any hissing of air leaking. At some point the "Ab/Eb" pad will blow open. That's fine, it will. It is worth noting that the spring tension of this key should be a hair more resistant than what you might want compared to the other three since you want the pad to resist opening (slightly but deleteriously) while playing (it can if the tension is too light and the result is that you lose a LOT of resonance).

The negative pressure test is of course taking sips of air out of the horn in the same manner. If you've ever done a similar execution with a coke bottle and feel your lips sinking into the top......it's the same thing. You should feel the suction holding. And when you release the bottom (or top, or a finger), you should hear a "pop."

Do the same operation to the top joint to check for leaks.

.................Paul Aviles

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